Cindy, if you are not having a problem planting them as you do, then don't change. My guess is that they sink some once the soil settles. The mulch that you use acts as a layer of soil, and it also breaks down over time. I know from experience that if they are too deep they will not bloom and are more likely to get crown rot as Pam said. I am of the opinion at this point in my life that we should do what works for each one of us and not worry about what someone else does or says. The information that I posted from AHS says to not plant any deeper than 1". That leaves much for interpretation.
